It depends on whether the substance is transparent, translucent or opaque. A transparent substance allows nearly all the light through. A translucent substance allows some light through. An opaque substance blocks all the light.
When light passes through a substance near 0 degrees Kelvin, it bends and becomes deformed.
It happens by the refraction of light.
sh@@ happens
The light will bend as it passes through.
The light refracts or bend .
It is transmitted.
the light bends
it refracts
It is redirected as it passes through a medium.
It is redirected as it passes through a medium
A rainbow
Light passes thru, gets absorbed or is reflected dependent on the wavelength of light and the density of the plasma.